The first half of my life I didn't know how babies came, and now, in my declining years, I don't know how you change publishers.
I recommend that your personal letters--but not your e-mail--include a handwritten P. Very few of us read a letter from top to bottom, in order. And that would be a shame.
Including a PS has long been a direct mail marketing strategy. Otherwise, hang onto this outline while I continue from my carbon.
Example of a direct mail P.
In general, always make sure to match the tone of any P. It will be enough for the author to assure the world, that the writer of that paper is utterly wrong in all his conjectures upon that affair. A postscript is usually introduced by the letters P.
Houghton Mifflin, Jonathan Swift's Postscript to A Tale of a Tub "Since the writing of this, which was about a year ago, a prostitute bookseller hath published a foolish paper, under the name of Notes on the Tale of a Tub, with some account of the author: and, with an insolence which, I suppose, is punishable by law, hath presumed to assign certain names.
Today, a P.